ULTRASONIC THICKNESS GAGE THROUGH COATIN ISU-300D Product Description Measuring range: E-E mode: coating thickness 0~.04", substrate thickness .16~.98"; T-E mode substrate thickness .03~11.81".Res: .001"(range<10"), .01"(range>-10"). Repeatability: .001" (range<4"), .004" (range 4-10"), .01" (range>-10"). Velocity .